Motion
Motion
•
Motion

the change in the position of an
object with respect to time and its
reference point
•
Motion is RELATIVE
•
Reference point/
frame of reference
:
a
point/object that is not moving
Reference Point and Relative Motion
Example:

If you are sitting on a train looking at your
neighbor, neither of you seem to be moving

If you look out the window at people standing
on the side, they seem to be moving
backwards

If the people on the side are looking at you,
you seem to be moving forward
Describing Motion
•
Distance

the length between two points
–
Units: meters, kilometers, etc.
•
Time
Speed
•
Speed

is the distance traveled per unit
of time
–
Units: m/s, km/s, etc.
S= speed
D = distance
t= time
Solve for other variables
:
D
= s*t
t= D/s
Formula
:
S
= D/t
Average Speed
•
The total distance divided by the total
time
Instantaneous Speed
•
The speed at any given instant
You must always show your
work and
units!!
ALWAYS METRICS
No answer is complete
without units!
Let’s try one!
Calculate the speed of a dog running through a field if
he is covering 23.7 meters in 54 seconds.
Given
:
Formula:
Find
:
Work
Space
:
If a cross country runner covers a distance of 347
meters in 134 seconds what is her speed?
Given:
Formula:
Find:
Work Space:
Velocity
Velocity

The speed and direction an object is
moving in
Units: speed and a direction
Example: The car’s velocity is 60 km/hr EAST
Try This:
Calculate the velocity of a dog running north through a
field if he is covering 23.7 meters in 54 seconds.
Given:
Formula:
Find:
Work Space:
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